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Research Papers: Multiphase Flows

Break-Up Length and Spreading Angle of Liquid Sheets Formed by Splash Plate Nozzles

[+] Author and Article Information
M. Ahmed1

Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Toronto, ON, M5S 3G8, Canada

N. Ashgriz2

Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Toronto, ON, M5S 3G8, Canadaashgriz@mie.utoronto.ca

H. N. Tran

Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON, M5S 3E5, Canada

1

Present address: Mechanical Engineering Department, Assiut University, Assiut 71516, Egypt.

2

Corresponding author.

J. Fluids Eng 131(1), 011306 (Dec 11, 2008) (9 pages) doi:10.1115/1.3026729 History: Received November 12, 2007; Revised August 15, 2008; Published December 11, 2008

An experimental investigation is conducted to determine the effect of liquid viscosity and density, nozzle diameter, and flow velocity on the break-up length and spreading angle of liquid sheets formed by splash plate nozzles. Various mixtures of corn syrup and water were used to obtain viscosities in the range of 1170mPas. Four different splash plate nozzle diameters of 0.5 mm, 0.75 mm, 1 mm, and 2 mm, with a constant plate angle of 55 deg were tested. The liquid sheet angles and the break-up lengths were measured at various operating conditions. An empirical correlation for the sheet spreading angle and a semi-empirical correlation for the sheet break-up lengths are developed.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

A sectional view of the splash plate nozzle

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Figure 2

Variation of viscosity versus percent by weight for two mixtures, corn syrup and water, and glycerol and water

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Figure 3

Schematic of the experimental setup

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Figure 4

Definition of spray angle θ

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Figure 5

Effect of liquid viscosity on the sheet spreading angle at a flow velocity of 24 m/s using the splash plate nozzle with a 1.0 mm diameter

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Figure 6

Effect of the splash plate nozzle flow velocity on the sheet spreading angle at different values of nozzle diameters and liquid viscosities. (a) Nozzle diameter=2.0 mm, μ=14.0mPa s; and (b) nozzle diameter=1.0 mm, μ=80.0 mPa s.

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Figure 7

Effect of the splash plate nozzle diameter on the sheet spreading angle at different values of flow velocities and liquid viscosities. (a) Flow velocity=13 m/s, μ=1.00 mPa s; and (b) flow velocity=17 m/s, μ=14 mPa s.

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Figure 8

Variation of the predicted sheet spreading angle versus the measured values

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Figure 9

The definition of the break-up length Lb

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Figure 10

Variation of the predicted break-up length versus the measured break-up length. (a) Breakup increases with increasing flow velocity, and (b) breakup decreases with increasing flow velocity.

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Figure 11

Variation of the predicted dimensionless break-up length versus the measured values. (a) Breakup increases with increasing flow velocity, and (b) breakup decreases with increasing flow velocity.

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Figure 12

Liquid jet impact on a horizontal surface

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Figure 13

Variation of the predicted dimensionless break-up length versus the measured values. (a) Breakup increases with increasing flow velocity, (b) breakup decreases with increasing flow velocity.

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Figure 14

Variation of the break-up length versus velocity at different values of the splash plate nozzle diameter for water (μ=1 mPa s)

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